docs: def get_proteome_correct_percentages(prots_filtered_feathers, outpath, length_filter_pid=None,
                                       copynum_scale=False, copynum_df=None,
                                       force_rerun=False):
      """Get counts and normalize by number of proteins, providing percentages"""
      if ssbio.utils.force_rerun(flag=force_rerun, outfile=outpath):
          prot_tracker = defaultdict(int)
          big_strain_counts_df = pd.DataFrame()
          first = True
          for feather in prots_filtered_feathers:
              loaded = load_feather(protein_feather=feather, length_filter_pid=length_filter_pid,
                                    copynum_scale=copynum_scale,
                                    copynum_df=copynum_df)
  
              if first:
                  big_strain_counts_df = pd.DataFrame(columns=loaded.columns)
                  first = False
              tmp_df = pd.DataFrame(columns=loaded.columns)
              for strain in loaded.columns:
                  prot_tracker[strain] += 1
                  totals = list(filter(lambda x: x.endswith('total'), loaded[strain].index))
                  for t in totals:
                      counts = t.rsplit('_', 1)[0]
                      aa_counts = list(
                          filter(lambda x: (x.startswith(counts) and x not in totals), loaded[strain].index))
                      for aa_count in aa_counts:
                          tmp_df.at[aa_count.replace('count', '%'), strain] = loaded[strain][aa_count] / \
                                                                              loaded[strain][t]
              big_strain_counts_df = big_strain_counts_df.add(tmp_df, fill_value=0)
  
          for c, total in prot_tracker.items():
              big_strain_counts_df.loc[:, c] /= total
  
          if len(big_strain_counts_df) > 0:
              big_strain_counts_df.astype(float).reset_index().to_feather(outpath)
          return big_strain_counts_df
      else:
          return pd.read_feather(outpath).set_index('index')